Celtic refers to a family of languages and, more generally, means "of the Celts" or "in the style of the Celts".Several archaeological cultures are considered Celtic in nature, based on unique sets of artefacts.
The exact geographic spread of the ancient Celts is also disputed; in particular, the ways in which the Iron Age inhabitants of Great Britain and Ireland should be regarded as Celts has become a subject of controversy.
The history of pre-Celtic Europe remains very uncertain.
The geographer Strabo, writing about Gaul towards the end of the first century BC, refers to the "race which is now called both Gallic and Galatic," though he also uses the term Celtica as a synonym for Gaul, which is separated from Iberia by the Pyrenees.
Yet he reports Celtic peoples in Iberia, and also uses the ethnic names Celtiberi and Celtici for peoples there, as distinct from Lusitani and Iberi. Galli) might stem from a Celtic ethnic or tribal name originally, perhaps one borrowed into Latin during the Celtic expansions into Italy during the early fifth century BC.
The Celts of Brittany derive their language from migrating insular Celts, mainly from Wales and Cornwall, and so are grouped accordingly.
The Celtic languages form a branch of the larger Indo-European family.Portugal and north-central Spain (Galicia, Asturias, Cantabria, Castile and León, Extremadura).Continental Celts are the Celtic-speaking people of mainland Europe and Insular Celts are the Celtic-speaking peoples of the British and Irish islands and their descendants.There are also attempts to reconstruct Cumbric, a Brittonic language from North West England and South West Scotland.Celtic regions of Continental Europe are those whose residents claim a Celtic heritage, but where no Celtic language has survived; these areas include the western Iberian Peninsula, i.e.Celt is a modern English word, first attested in 1707, in the writing of Edward Lhuyd, whose work, along with that of other late 17th-century scholars, brought academic attention to the languages and history of the early Celtic inhabitants of Great Britain.